How do I view the animation I rendered?
There are two ways to render an animation in blender:

Render as Video
Render as Image Sequence

My suggestion is to use the second method (Render as Image Sequence) for having a list of benefits:

you'll have all the single frames not compresses (best settings are saving single frames as PNG or any lossless image type), so if you need to edit something later on you can do it
you'll decode the video after, so you can always change the compression and format (just use ffmpeg to get quicker and best results) (if you just render the animation as video in Blender and if you select a compression too low, you cannot fix that later)
if your computer crash you'll have the single frames (if it crashes while rendering the video, I fear you'll get a corrupted video in the best scenario, you'll get nothing in the worst scenario)

Your file (or files) are in the folder you specified as OUTPUT (in the output properties).
It can be also in the TMP folder. In this case you need to find out where the TMP folder is on your pc by typing %tmp% in your windows search bar